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Analog Devices Inc. LTC3528EDDB-2#TRPBF
- Part No.:
- LTC3528EDDB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3528EDDB-2#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
LTC3528EDDB-2#TRPBF from Analog Devices (formerly Linear Technology) is a 2MHz synchronous step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. It starts up from 700mV, operates down to 500mV input, delivers up to 400mA at 3.3V from two alkaline/NiMH cells, and integrates synchronous rectification, Burst Mode® operation, and internal soft-start.
For engineers reviewing the LTC3528EDDB-2#TRPBF datasheet, LTC3528EDDB-2#TRPBF pinout, LTC3528EDDB-2#TRPBF application, or LTC3528EDDB-2#TRPBF equivalent, key selection criteria include start-up voltage margin, light-load efficiency in Burst Mode, output disconnect capability, and compatibility with miniature 2mm × 3mm DFN layouts in space-constrained portable electronics.
Technical Context
The LTC3528EDDB-2#TRPBF employs fixed-frequency current-mode PWM control with internal slope compensation and adaptive zero-current detection to maintain stability across wide input/output ratios. Its dual-MOSFET synchronous architecture-featuring 175mΩ N-channel switch and 250mΩ P-channel rectifier-enables high efficiency while supporting VIN > VOUT regulation and true output disconnect during shutdown.
Startup is managed by a dedicated low-voltage oscillator independent of main regulation, enabling operation below 0.88V. Anti-ringing circuitry actively damps SW-node resonance in discontinuous conduction mode, reducing EMI without external snubbers. Thermal shutdown activates at 160°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Start-Up Voltage | 700mV typical - enables reliable startup from single depleted alkaline/NiMH cell |
| Input Voltage Range | 0.5V to 5.5V - supports deep discharge operation and VIN > VOUT pass-through mode |
| Output Voltage Range | 1.6V to 5.25V - programmable via external resistor divider for diverse rail requirements |
| Switching Frequency | 2MHz fixed - allows use of sub-3mm ceramic inductors and compact 10µF ceramic output capacitors |
| Peak Switch Current Limit | 1.5A typical - sets maximum deliverable power under low-VIN conditions |
| Burst Mode Quiescent Current | 12µA - extends battery life in standby/sleep states of portable devices |
| Efficiency | Up to 94% - achieved via synchronous rectification and low RDS(ON) MOSFETs |
| Package | 8-lead 2mm × 3mm × 0.75mm DFN - exposes thermal pad for PCB heat sinking and low θJA = 76°C/W |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed GND pad (Pin 9), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-controlled shutdown input | Pulled high (>0.88V) for operation; pulled low (<0.25V) for <1µA shutdown current; internal 4MΩ pull-down |
| FB (Pin 2) | Feedback voltage sense node | Compares divided VOUT against 1.20V reference to regulate output; supports 1.6–5.25V programming |
| PGOOD (Pin 3) | Open-drain power-good flag | Asserts low when VFB drops >10% below regulation threshold; requires external pull-up |
| VOUT (Pin 4) | Regulated output & synchronous rectifier drain | Connects to output capacitor; body diode is blocked during shutdown for true output disconnect |
| SW (Pin 5) | Switch node | Drives external inductor; anti-ringing switch connects SW to VIN during DCM to suppress ringing |
| PGND (Pin 6) | Power ground return | Low-impedance path for high-current inductor return; must tie directly to input/output capacitor negatives |
| SGND (Pin 7) | Signal ground reference | Separate low-noise ground for FB/PGOOD/SHDN; routed separately from PGND but joined at single point |
| VIN (Pin 8) | Main input supply | Accepts 0.5–5.5V; requires ≥1µF ceramic decoupling close to pin; powers IC until VOUT > VIN + 0.24V |
| GND (Exposed Pad) | Thermal & electrical ground | Must be soldered to PCB ground plane; serves as additional GND connection and primary heat dissipation path |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates reverse current through internal P-MOSFET body diode during shutdown, enabling VOUT = 0V and zero input drain |
| Anti-ringing control | Internally shorts SW to VIN during discontinuous conduction mode, suppressing high-frequency EMI without external components |
| Integrated soft-start | Ramps peak inductor current from 0 to 1.5A over ~0.5ms, preventing inrush into heavy loads |
| Current-mode PWM with internal compensation | Enables stable operation with minimal external parts; no loop compensation components required |
| Low-noise Burst Mode® | Maintains 1% p-p ripple with ≥10µF output capacitance while achieving 12µA quiescent current at light loads |
| Thermal overload protection | Shuts down all switches at 160°C junction temperature; resumes operation after 15°C cooldown |
Applications
| Noise-Canceling Headphones | Wireless Mice |
|---|---|
Use Scenario: Powering analog front-end and DSP in battery-operated active noise cancellation circuits. IC Role / Device Role / Timing Role: Step-up regulator generating clean 3.3V rail from single 1.5V alkaline cell, with output disconnect preserving battery during sleep. Use Value: 700mV startup ensures full runtime from fresh to fully depleted cell; Burst Mode extends standby time beyond 6 months. | Use Scenario: Supplying 1.8V or 3.3V to RF transceiver and MCU in ultra-low-power USB wireless mice. IC Role / Device Role / Timing Role: Synchronous boost converter delivering regulated output with minimal quiescent current and fast load transient response. Use Value: 12µA Burst Mode current and 2MHz switching enable rapid wake-from-sleep without output droop or audible coil whine. |
| Bluetooth Headsets | Medical Instruments |
Use Scenario: Providing stable 3.3V bias to Bluetooth radio and audio codec in compact ear-worn devices. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter operating from single NiMH cell (0.9–1.4V), with integrated soft-start and PGOOD signaling. Use Value: True output disconnect prevents battery drain during headset off-state; 2MHz frequency avoids AM radio band interference. | Use Scenario: Powering precision sensor signal chains and low-power microcontrollers in portable diagnostic tools. IC Role / Device Role / Timing Role: Ultra-low-input-voltage boost regulator supplying regulated rails to analog front-ends requiring low noise and high PSRR. Use Value: Internal anti-ringing and current-mode control minimize conducted EMI critical for FDA-compliant medical EMC testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 0.3V startup, 1.2MHz switching, no output disconnect, 1.2A switch current limit | Lacks true output disconnect; higher quiescent current (50µA in shutdown) | Preferred where lowest possible startup voltage is critical and output disconnect is not required |
| MAX17222ELT+T | 0.4V startup, 1.2MHz, integrated output disconnect, 0.5A max output current | Lower max output current; smaller 2mm × 2mm package; no PGOOD output | Selected for ultra-small footprint and sub-0.5V startup in wearables where 400mA is not needed |
Compared with TPS61200DRCT and MAX17222ELT+T, the LTC3528EDDB-2#TRPBF uniquely combines 700mV startup, 2MHz operation for minimal passive size, true output disconnect, and 400mA capability - making it optimal for space-constrained, multi-cell-equivalent portable systems demanding long shelf life and clean shutdown behavior.
Availability
LTC3528EDDB-2#TRPBF is available at Aetrix Electronics and suitable for noise-canceling headphones, wireless mice, Bluetooth headsets, and portable medical instruments requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3528EDDB-2#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs for demanding analog applications.
The LTC3528-2 belongs to Linear's ultra-low-voltage boost converter product line, engineered specifically for single- and dual-cell battery systems where extended runtime, small solution size, and clean shutdown behavior are essential.
FAQ
What is the minimum input voltage required for LTC3528EDDB-2#TRPBF to start up?
The LTC3528EDDB-2#TRPBF has a typical startup voltage of 700mV and guarantees startup at ≤880mV under 1mA load. This allows reliable operation from deeply discharged single alkaline or NiMH cells. Once started, it continues regulating down to 500mV input. The device uses a dedicated low-voltage oscillator for startup, independent of the main control loop, ensuring robust cold-start capability in LTC3528EDDB-2#TRPBF designs.
Does LTC3528EDDB-2#TRPBF support output voltages above the input voltage?
Yes, LTC3528EDDB-2#TRPBF supports VIN > VOUT operation, maintaining regulation even when input exceeds programmed output. However, efficiency drops significantly in this mode due to reduced duty cycle and increased conduction losses. Maximum output current is also reduced. The LTC3528EDDB-2#TRPBF datasheet provides efficiency curves for VIN > VOUT conditions, and the internal control loop remains stable without external compensation.
How does the output disconnect feature work in LTC3528EDDB-2#TRPBF?
LTC3528EDDB-2#TRPBF achieves true output disconnect by blocking conduction through the internal P-channel MOSFET's body diode during shutdown. When SHDN is pulled low, both switches turn off and the synchronous rectifier is disabled, allowing VOUT to fall to 0V with no reverse current drawn from VIN. This eliminates battery drain in off-state and enables safe inrush limiting. Adding an external Schottky diode defeats this feature in LTC3528EDDB-2#TRPBF applications.
What is the purpose of the exposed pad on the LTC3528EDDB-2#TRPBF DFN package?
The exposed pad (Pin 9) on the LTC3528EDDB-2#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 76°C/W and ensure reliable thermal performance. Failure to connect it results in significantly higher junction temperatures, potentially triggering thermal shutdown under normal load. The pad also provides a low-inductance ground return path critical for EMI control in LTC3528EDDB-2#TRPBF layouts.
Can LTC3528EDDB-2#TRPBF operate in Burst Mode with a 5V output?
LTC3528EDDB-2#TRPBF enters Burst Mode automatically at light loads, but for 5V output from a single cell (VIN < 1.5V), Burst Mode may not engage due to high inductor slew rate limitations. The datasheet recommends the 1MHz LTC3528 for such cases. At higher VIN (e.g., two cells), LTC3528EDDB-2#TRPBF reliably enters Burst Mode with 12µA quiescent current and ~1% p-p ripple when using ≥10µF output capacitance.
LTC3528EDDB-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.88V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3528EDDB-2#TRPBF FAQ
1.How can I place an order for LTC3528EDDB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3528EDDB-2#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3528EDDB-2#TRPBF reliable?
The price and inventory of LTC3528EDDB-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3528EDDB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3528EDDB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3528EDDB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3528EDDB-2#TRPBF?
LTC3528EDDB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3528EDDB-2#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3528EDDB-2#TRPBF?
For technical support, including LTC3528EDDB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3528EDDB-2#TRPBF requirements.
6.How does Aetrix verify that LTC3528EDDB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3528EDDB-2#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3528EDDB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3528EDDB-2#TRPBF?
All LTC3528EDDB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3528EDDB-2#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3528EDDB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3528EDDB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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